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December 05, 2012 - Day of the Ninja - Ninjas were covert agents in feudal Japan (1185-1868) who famously dressed in uniforms that disguised their faces. Words associated with ninjas include espionage, sabotage, and assassination. One word not associated with ninjas: day. So don't be surprised if you don't spot many ninjas on Day of the Ninja. Real ninjas come out after dark.